Ideal accessories for the wdh security storage box the use of lead free solder can lead to increased oxide formation on the surface of the solder tip these oxides must be carefully removed as they soon form a black unwettable separating coating cleaning the solder tip in the weller wdc dry cleaner involves the use of a special wool spiral in the preliminary cleaning stage the contaminated used solder is knocked against a soft edge into the collector then in the advanced cleaning stage the